19 files changed, 324 insertions, 189 deletions

diff --git a/lib/api/api.rb b/lib/api/api.rb
index 79e55a2f4f7..c37e596eb9d 100644
--- a/lib/api/api.rb
+++ b/lib/api/api.rb
@@ -4,6 +4,10 @@ module API
 
     LOG_FILENAME = Rails.root.join("log", "api_json.log")
 
+    NO_SLASH_URL_PART_REGEX = %r{[^/]+}
+    PROJECT_ENDPOINT_REQUIREMENTS = { id: NO_SLASH_URL_PART_REGEX }.freeze
+    COMMIT_ENDPOINT_REQUIREMENTS = PROJECT_ENDPOINT_REQUIREMENTS.merge(sha: NO_SLASH_URL_PART_REGEX).freeze
+
     use GrapeLogging::Middleware::RequestLogger,
         logger: Logger.new(LOG_FILENAME),
         formatter: Gitlab::GrapeLogging::Formatters::LogrageWithTimestamp.new,
@@ -96,9 +100,6 @@ module API
     helpers ::API::Helpers
     helpers ::API::Helpers::CommonHelpers
 
-    NO_SLASH_URL_PART_REGEX = %r{[^/]+}
-    PROJECT_ENDPOINT_REQUIREMENTS = { id: NO_SLASH_URL_PART_REGEX }.freeze
-
     # Keep in alphabetical order
     mount ::API::AccessRequests
     mount ::API::AwardEmoji
@@ -130,6 +131,7 @@ module API
     mount ::API::Namespaces
     mount ::API::Notes
     mount ::API::NotificationSettings
+    mount ::API::PagesDomains
     mount ::API::Pipelines
     mount ::API::PipelineSchedules
     mount ::API::ProjectHooks
@@ -140,7 +142,6 @@ module API
     mount ::API::Runner
     mount ::API::Runners
     mount ::API::Services
-    mount ::API::Session
     mount ::API::Settings
     mount ::API::SidekiqMetrics
     mount ::API::Snippets
diff --git a/lib/api/api_guard.rb b/lib/api/api_guard.rb
index e79f988f549..b9c7d443f6c 100644
--- a/lib/api/api_guard.rb
+++ b/lib/api/api_guard.rb
@@ -42,88 +42,101 @@ module API
 
     # Helper Methods for Grape Endpoint
     module HelperMethods
-      # Invokes the doorkeeper guard.
-      #
-      # If token is presented and valid, then it sets @current_user.
-      #
-      # If the token does not have sufficient scopes to cover the requred scopes,
-      # then it raises InsufficientScopeError.
-      #
-      # If the token is expired, then it raises ExpiredError.
-      #
-      # If the token is revoked, then it raises RevokedError.
-      #
-      # If the token is not found (nil), then it returns nil
-      #
-      # Arguments:
-      #
-      #   scopes: (optional) scopes required for this guard.
-      #           Defaults to empty array.
-      #
-      def doorkeeper_guard(scopes: [])
-        access_token = find_access_token
-        return nil unless access_token
+      def find_current_user!
+        user = find_user_from_access_token || find_user_from_warden
+        return unless user
+
+        forbidden!('User is blocked') unless Gitlab::UserAccess.new(user).allowed? && user.can?(:access_api)
+
+        user
+      end
+
+      def access_token
+        return @access_token if defined?(@access_token)
+
+        @access_token = find_oauth_access_token || find_personal_access_token
+      end
+
+      def validate_access_token!(scopes: [])
+        return unless access_token
 
         case AccessTokenValidationService.new(access_token, request: request).validate(scopes: scopes)
         when AccessTokenValidationService::INSUFFICIENT_SCOPE
           raise InsufficientScopeError.new(scopes)
-
         when AccessTokenValidationService::EXPIRED
           raise ExpiredError
-
         when AccessTokenValidationService::REVOKED
           raise RevokedError
-
-        when AccessTokenValidationService::VALID
-          User.find(access_token.resource_owner_id)
         end
       end
 
-      def find_user_by_private_token(scopes: [])
-        token_string = (params[PRIVATE_TOKEN_PARAM] || env[PRIVATE_TOKEN_HEADER]).to_s
+      private
 
-        return nil unless token_string.present?
+      def find_user_from_access_token
+        return unless access_token
 
-        user =
-          find_user_by_authentication_token(token_string) ||
-          find_user_by_personal_access_token(token_string, scopes)
+        validate_access_token!
 
-        raise UnauthorizedError unless user
+        access_token.user || raise(UnauthorizedError)
+      end
 
-        user
+      # Check the Rails session for valid authentication details
+      def find_user_from_warden
+        warden.try(:authenticate) if verified_request?
       end
 
-      private
+      def warden
+        env['warden']
+      end
 
-      def find_user_by_authentication_token(token_string)
-        User.find_by_authentication_token(token_string)
+      # Check if the request is GET/HEAD, or if CSRF token is valid.
+      def verified_request?
+        Gitlab::RequestForgeryProtection.verified?(env)
       end
 
-      def find_user_by_personal_access_token(token_string, scopes)
-        access_token = PersonalAccessToken.active.find_by_token(token_string)
-        return unless access_token
+      def find_oauth_access_token
+        token = Doorkeeper::OAuth::Token.from_request(doorkeeper_request, *Doorkeeper.configuration.access_token_methods)
+        return unless token
 
-        if AccessTokenValidationService.new(access_token, request: request).include_any_scope?(scopes)
-          User.find(access_token.user_id)
-        end
+        # Expiration, revocation and scopes are verified in `find_user_by_access_token`
+        access_token = OauthAccessToken.by_token(token)
+        raise UnauthorizedError unless access_token
+
+        access_token.revoke_previous_refresh_token!
+        access_token
       end
 
-      def find_access_token
-        return @access_token if defined?(@access_token)
+      def find_personal_access_token
+        token = (params[PRIVATE_TOKEN_PARAM] || env[PRIVATE_TOKEN_HEADER]).to_s
+        return unless token.present?
 
-        token = Doorkeeper::OAuth::Token.from_request(doorkeeper_request, *Doorkeeper.configuration.access_token_methods)
-        return @access_token = nil unless token
+        # Expiration, revocation and scopes are verified in `find_user_by_access_token`
+        access_token = PersonalAccessToken.find_by(token: token)
+        raise UnauthorizedError unless access_token
 
-        @access_token = Doorkeeper::AccessToken.by_token(token)
-        raise UnauthorizedError unless @access_token
-
-        @access_token.revoke_previous_refresh_token!
-        @access_token
+        access_token
       end
 
       def doorkeeper_request
         @doorkeeper_request ||= ActionDispatch::Request.new(env)
       end
+
+      # An array of scopes that were registered (using `allow_access_with_scope`)
+      # for the current endpoint class. It also returns scopes registered on
+      # `API::API`, since these are meant to apply to all API routes.
+      def scopes_registered_for_endpoint
+        @scopes_registered_for_endpoint ||=
+          begin
+            endpoint_classes = [options[:for].presence, ::API::API].compact
+            endpoint_classes.reduce([]) do |memo, endpoint|
+              if endpoint.respond_to?(:allowed_scopes)
+                memo.concat(endpoint.allowed_scopes)
+              else
+                memo
+              end
+            end
+          end
+      end
     end
 
     module ClassMethods
@@ -185,7 +198,7 @@ module API
     class InsufficientScopeError < StandardError
       attr_reader :scopes
       def initialize(scopes)
-        @scopes = scopes
+        @scopes = scopes.map { |s| s.try(:name) || s }
       end
     end
   end
diff --git a/lib/api/branches.rb b/lib/api/branches.rb
index 61a2d688282..cdef1b546a9 100644
--- a/lib/api/branches.rb
+++ b/lib/api/branches.rb
@@ -8,6 +8,16 @@ module API
 
     before { authorize! :download_code, user_project }
 
+    helpers do
+      def find_branch!(branch_name)
+        begin
+          user_project.repository.find_branch(branch_name) || not_found!('Branch')
+        rescue Gitlab::Git::CommandError
+          render_api_error!('The branch refname is invalid', 400)
+        end
+      end
+    end
+
     params do
       requires :id, type: String, desc: 'The ID of a project'
     end
@@ -19,12 +29,11 @@ module API
         use :pagination
       end
       get ':id/repository/branches' do
-        branches = ::Kaminari.paginate_array(user_project.repository.branches.sort_by(&:name))
+        repository = user_project.repository
+        branches = ::Kaminari.paginate_array(repository.branches.sort_by(&:name))
+        merged_branch_names = repository.merged_branch_names(branches.map(&:name))
 
-        # n+1: https://gitlab.com/gitlab-org/gitlab-ce/issues/37442
-        Gitlab::GitalyClient.allow_n_plus_1_calls do
-          present paginate(branches), with: Entities::Branch, project: user_project
-        end
+        present paginate(branches), with: Entities::Branch, project: user_project, merged_branch_names: merged_branch_names
       end
 
       resource ':id/repository/branches/:branch', requirements: BRANCH_ENDPOINT_REQUIREMENTS do
@@ -38,8 +47,7 @@ module API
           user_project.repository.branch_exists?(params[:branch]) ? status(204) : status(404)
         end
         get do
-          branch = user_project.repository.find_branch(params[:branch])
-          not_found!('Branch') unless branch
+          branch = find_branch!(params[:branch])
 
           present branch, with: Entities::Branch, project: user_project
         end
@@ -60,8 +68,7 @@ module API
       put ':id/repository/branches/:branch/protect', requirements: BRANCH_ENDPOINT_REQUIREMENTS do
         authorize_admin_project
 
-        branch = user_project.repository.find_branch(params[:branch])
-        not_found!('Branch') unless branch
+        branch = find_branch!(params[:branch])
 
         protected_branch = user_project.protected_branches.find_by(name: branch.name)
 
@@ -96,8 +103,7 @@ module API
       put ':id/repository/branches/:branch/unprotect', requirements: BRANCH_ENDPOINT_REQUIREMENTS do
         authorize_admin_project
 
-        branch = user_project.repository.find_branch(params[:branch])
-        not_found!("Branch") unless branch
+        branch = find_branch!(params[:branch])
         protected_branch = user_project.protected_branches.find_by(name: branch.name)
         protected_branch&.destroy
 
@@ -133,8 +139,7 @@ module API
       delete ':id/repository/branches/:branch', requirements: BRANCH_ENDPOINT_REQUIREMENTS do
         authorize_push_project
 
-        branch = user_project.repository.find_branch(params[:branch])
-        not_found!('Branch') unless branch
+        branch = find_branch!(params[:branch])
 
         commit = user_project.repository.commit(branch.dereferenced_target)
 
diff --git a/lib/api/commits.rb b/lib/api/commits.rb
index 4af37a2ad1d..2685dc27252 100644
--- a/lib/api/commits.rb
+++ b/lib/api/commits.rb
@@ -4,8 +4,6 @@ module API
   class Commits < Grape::API
     include PaginationParams
 
-    COMMIT_ENDPOINT_REQUIREMENTS = API::PROJECT_ENDPOINT_REQUIREMENTS.merge(sha: API::NO_SLASH_URL_PART_REGEX)
-
     before { authorize! :download_code, user_project }
 
     params do
@@ -85,7 +83,7 @@ module API
       params do
         requires :sha, type: String, desc: 'A commit sha, or the name of a branch or tag'
       end
-      get ':id/repository/commits/:sha', requirements: COMMIT_ENDPOINT_REQUIREMENTS do
+      get ':id/repository/commits/:sha', requirements: API::COMMIT_ENDPOINT_REQUIREMENTS do
         commit = user_project.commit(params[:sha])
 
         not_found! 'Commit' unless commit
@@ -99,7 +97,7 @@ module API
       params do
         requires :sha, type: String, desc: 'A commit sha, or the name of a branch or tag'
       end
-      get ':id/repository/commits/:sha/diff', requirements: COMMIT_ENDPOINT_REQUIREMENTS do
+      get ':id/repository/commits/:sha/diff', requirements: API::COMMIT_ENDPOINT_REQUIREMENTS do
         commit = user_project.commit(params[:sha])
 
         not_found! 'Commit' unless commit
@@ -115,7 +113,7 @@ module API
         use :pagination
         requires :sha, type: String, desc: 'A commit sha, or the name of a branch or tag'
       end
-      get ':id/repository/commits/:sha/comments', requirements: COMMIT_ENDPOINT_REQUIREMENTS do
+      get ':id/repository/commits/:sha/comments', requirements: API::COMMIT_ENDPOINT_REQUIREMENTS do
         commit = user_project.commit(params[:sha])
 
         not_found! 'Commit' unless commit
@@ -132,7 +130,7 @@ module API
         requires :sha, type: String, desc: 'A commit sha, or the name of a branch or tag to be cherry picked'
         requires :branch, type: String, desc: 'The name of the branch'
       end
-      post ':id/repository/commits/:sha/cherry_pick', requirements: COMMIT_ENDPOINT_REQUIREMENTS do
+      post ':id/repository/commits/:sha/cherry_pick', requirements: API::COMMIT_ENDPOINT_REQUIREMENTS do
         authorize! :push_code, user_project
 
         commit = user_project.commit(params[:sha])
@@ -169,7 +167,7 @@ module API
           requires :line_type, type: String, values: %w(new old), default: 'new', desc: 'The type of the line'
         end
       end
-      post ':id/repository/commits/:sha/comments', requirements: COMMIT_ENDPOINT_REQUIREMENTS do
+      post ':id/repository/commits/:sha/comments', requirements: API::COMMIT_ENDPOINT_REQUIREMENTS do
         commit = user_project.commit(params[:sha])
         not_found! 'Commit' unless commit
 
@@ -186,7 +184,7 @@ module API
 
             lines.each do |line|
               next unless line.new_pos == params[:line] && line.type == params[:line_type]
-              break opts[:line_code] = Gitlab::Diff::LineCode.generate(diff.new_path, line.new_pos, line.old_pos)
+              break opts[:line_code] = Gitlab::Git.diff_line_code(diff.new_path, line.new_pos, line.old_pos)
             end
 
             break if opts[:line_code]
diff --git a/lib/api/entities.rb b/lib/api/entities.rb
index 5f0bad14839..a382db92e8d 100644
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
@@ -57,10 +57,6 @@ module API
       expose :admin?, as: :is_admin
     end
 
-    class UserWithPrivateDetails < UserWithAdmin
-      expose :private_token
-    end
-
     class Email < Grape::Entity
       expose :id, :email
     end
@@ -246,10 +242,7 @@ module API
       end
 
       expose :merged do |repo_branch, options|
-        # n+1: https://gitlab.com/gitlab-org/gitlab-ce/issues/37442
-        Gitlab::GitalyClient.allow_n_plus_1_calls do
-          options[:project].repository.merged_to_root_ref?(repo_branch.name)
-        end
+        options[:project].repository.merged_to_root_ref?(repo_branch, options[:merged_branch_names])
       end
 
       expose :protected do |repo_branch, options|
@@ -482,6 +475,10 @@ module API
       expose :subscribed do |merge_request, options|
         merge_request.subscribed?(options[:current_user], options[:project])
       end
+
+      expose :changes_count do |merge_request, _options|
+        merge_request.merge_request_diff.real_size
+      end
     end
 
     class MergeRequestChanges < MergeRequest
@@ -826,6 +823,7 @@ module API
     class Job < Grape::Entity
       expose :id, :status, :stage, :name, :ref, :tag, :coverage
       expose :created_at, :started_at, :finished_at
+      expose :duration
       expose :user, with: User
       expose :artifacts_file, using: JobArtifactFile, if: -> (job, opts) { job.artifacts? }
       expose :commit, with: Commit
@@ -1043,5 +1041,22 @@ module API
       expose :key
       expose :value
     end
+
+    class PagesDomainCertificate < Grape::Entity
+      expose :subject
+      expose :expired?, as: :expired
+      expose :certificate
+      expose :certificate_text
+    end
+
+    class PagesDomain < Grape::Entity
+      expose :domain
+      expose :url
+      expose :certificate,
+             if: ->(pages_domain, _) { pages_domain.certificate? },
+             using: PagesDomainCertificate do |pages_domain|
+        pages_domain
+      end
+    end
   end
 end
diff --git a/lib/api/groups.rb b/lib/api/groups.rb
index e817dcbbc4b..340a7cecf09 100644
--- a/lib/api/groups.rb
+++ b/lib/api/groups.rb
@@ -37,6 +37,8 @@ module API
     end
 
     resource :groups do
+      include CustomAttributesEndpoints
+
       desc 'Get a groups list' do
         success Entities::Group
       end
@@ -51,7 +53,12 @@ module API
         use :pagination
       end
       get do
-        find_params = { all_available: params[:all_available], owned: params[:owned] }
+        find_params = {
+          all_available: params[:all_available],
+          owned: params[:owned],
+          custom_attributes: params[:custom_attributes]
+        }
+
         groups = GroupsFinder.new(current_user, find_params).execute
         groups = groups.search(params[:search]) if params[:search].present?
         groups = groups.where.not(id: params[:skip_groups]) if params[:skip_groups].present?
diff --git a/lib/api/helpers.rb b/lib/api/helpers.rb
index 67ef329f01f..6e58022a265 100644
--- a/lib/api/helpers.rb
+++ b/lib/api/helpers.rb
@@ -3,8 +3,6 @@ module API
     include Gitlab::Utils
     include Helpers::Pagination
 
-    UnauthorizedError = Class.new(StandardError)
-
     SUDO_HEADER = "HTTP_SUDO".freeze
     SUDO_PARAM = :sudo
 
@@ -43,6 +41,8 @@ module API
 
       sudo!
 
+      validate_access_token!(scopes: scopes_registered_for_endpoint) unless sudo?
+
       @current_user
     end
 
@@ -186,6 +186,10 @@ module API
       end
     end
 
+    def require_pages_enabled!
+      not_found! unless user_project.pages_available?
+    end
+
     def can?(object, action, subject = :global)
       Ability.allowed?(object, action, subject)
     end
@@ -324,6 +328,7 @@ module API
       finder_params[:archived] = params[:archived]
       finder_params[:search] = params[:search] if params[:search]
       finder_params[:user] = params.delete(:user) if params[:user]
+      finder_params[:custom_attributes] = params[:custom_attributes] if params[:custom_attributes]
       finder_params
     end
 
@@ -379,67 +384,35 @@ module API
 
     private
 
-    def private_token
-      params[APIGuard::PRIVATE_TOKEN_PARAM] || env[APIGuard::PRIVATE_TOKEN_HEADER]
-    end
-
-    def warden
-      env['warden']
-    end
-
-    # Check if the request is GET/HEAD, or if CSRF token is valid.
-    def verified_request?
-      Gitlab::RequestForgeryProtection.verified?(env)
-    end
-
-    # Check the Rails session for valid authentication details
-    def find_user_from_warden
-      warden.try(:authenticate) if verified_request?
-    end
-
     def initial_current_user
       return @initial_current_user if defined?(@initial_current_user)
 
       begin
-        @initial_current_user = Gitlab::Auth::UniqueIpsLimiter.limit_user! { find_current_user }
-      rescue APIGuard::UnauthorizedError, UnauthorizedError
+        @initial_current_user = Gitlab::Auth::UniqueIpsLimiter.limit_user! { find_current_user! }
+      rescue APIGuard::UnauthorizedError
         unauthorized!
       end
     end
 
-    def find_current_user
-      user =
-        find_user_by_private_token(scopes: scopes_registered_for_endpoint) ||
-        doorkeeper_guard(scopes: scopes_registered_for_endpoint) ||
-        find_user_from_warden
-
-      return nil unless user
-
-      raise UnauthorizedError unless Gitlab::UserAccess.new(user).allowed? && user.can?(:access_api)
-
-      user
-    end
-
     def sudo!
       return unless sudo_identifier
-      return unless initial_current_user
+
+      unauthorized! unless initial_current_user
 
       unless initial_current_user.admin?
         forbidden!('Must be admin to use sudo')
       end
 
-      # Only private tokens should be used for the SUDO feature
-      unless private_token == initial_current_user.private_token
-        forbidden!('Private token must be specified in order to use sudo')
+      unless access_token
+        forbidden!('Must be authenticated using an OAuth or Personal Access Token to use sudo')
       end
 
+      validate_access_token!(scopes: [:sudo])
+
       sudoed_user = find_user(sudo_identifier)
+      not_found!("User with ID or username '#{sudo_identifier}'") unless sudoed_user
 
-      if sudoed_user
-        @current_user = sudoed_user
-      else
-        not_found!("No user id or username for: #{sudo_identifier}")
-      end
+      @current_user = sudoed_user
     end
 
     def sudo_identifier
@@ -479,22 +452,5 @@ module API
 
       exception.status == 500
     end
-
-    # An array of scopes that were registered (using `allow_access_with_scope`)
-    # for the current endpoint class. It also returns scopes registered on
-    # `API::API`, since these are meant to apply to all API routes.
-    def scopes_registered_for_endpoint
-      @scopes_registered_for_endpoint ||=
-        begin
-          endpoint_classes = [options[:for].presence, ::API::API].compact
-          endpoint_classes.reduce([]) do |memo, endpoint|
-            if endpoint.respond_to?(:allowed_scopes)
-              memo.concat(endpoint.allowed_scopes)
-            else
-              memo
-            end
-          end
-        end
-    end
   end
 end
diff --git a/lib/api/merge_requests.rb b/lib/api/merge_requests.rb
index be843ec8251..726f09e3669 100644
--- a/lib/api/merge_requests.rb
+++ b/lib/api/merge_requests.rb
@@ -295,7 +295,7 @@ module API
 
         unauthorized! unless merge_request.can_cancel_merge_when_pipeline_succeeds?(current_user)
 
-        ::MergeRequest::MergeWhenPipelineSucceedsService
+        ::MergeRequests::MergeWhenPipelineSucceedsService
           .new(merge_request.target_project, current_user)
           .cancel(merge_request)
       end
diff --git a/lib/api/pages_domains.rb b/lib/api/pages_domains.rb
new file mode 100644
index 00000000000..259f3f34068
--- /dev/null
+++ b/lib/api/pages_domains.rb
@@ -0,0 +1,117 @@
+module API
+  class PagesDomains < Grape::API
+    include PaginationParams
+
+    before do
+      authenticate!
+      require_pages_enabled!
+    end
+
+    after_validation do
+      normalize_params_file_to_string
+    end
+
+    helpers do
+      def find_pages_domain!
+        user_project.pages_domains.find_by(domain: params[:domain]) || not_found!('PagesDomain')
+      end
+
+      def pages_domain
+        @pages_domain ||= find_pages_domain!
+      end
+
+      def normalize_params_file_to_string
+        params.each do |k, v|
+          if v.is_a?(Hash) && v.key?(:tempfile)
+            params[k] = v[:tempfile].to_a.join('')
+          end
+        end
+      end
+    end
+
+    params do
+      requires :id, type: String, desc: 'The ID of a project'
+    end
+    resource :projects, requirements: { id: %r{[^/]+} } do
+      desc 'Get all pages domains' do
+        success Entities::PagesDomain
+      end
+      params do
+        use :pagination
+      end
+      get ":id/pages/domains" do
+        authorize! :read_pages, user_project
+
+        present paginate(user_project.pages_domains.order(:domain)), with: Entities::PagesDomain
+      end
+
+      desc 'Get a single pages domain' do
+        success Entities::PagesDomain
+      end
+      params do
+        requires :domain, type: String, desc: 'The domain'
+      end
+      get ":id/pages/domains/:domain", requirements: { domain: %r{[^/]+} } do
+        authorize! :read_pages, user_project
+
+        present pages_domain, with: Entities::PagesDomain
+      end
+
+      desc 'Create a new pages domain' do
+        success Entities::PagesDomain
+      end
+      params do
+        requires :domain, type: String, desc: 'The domain'
+        optional :certificate, allow_blank: false, types: [File, String], desc: 'The certificate'
+        optional :key, allow_blank: false, types: [File, String], desc: 'The key'
+        all_or_none_of :certificate, :key
+      end
+      post ":id/pages/domains" do
+        authorize! :update_pages, user_project
+
+        pages_domain_params = declared(params, include_parent_namespaces: false)
+        pages_domain = user_project.pages_domains.create(pages_domain_params)
+
+        if pages_domain.persisted?
+          present pages_domain, with: Entities::PagesDomain
+        else
+          render_validation_error!(pages_domain)
+        end
+      end
+
+      desc 'Updates a pages domain'
+      params do
+        requires :domain, type: String, desc: 'The domain'
+        optional :certificate, allow_blank: false, types: [File, String], desc: 'The certificate'
+        optional :key, allow_blank: false, types: [File, String], desc: 'The key'
+      end
+      put ":id/pages/domains/:domain", requirements: { domain: %r{[^/]+} } do
+        authorize! :update_pages, user_project
+
+        pages_domain_params = declared(params, include_parent_namespaces: false)
+
+        # Remove empty private key if certificate is not empty.
+        if pages_domain_params[:certificate] && !pages_domain_params[:key]
+          pages_domain_params.delete(:key)
+        end
+
+        if pages_domain.update(pages_domain_params)
+          present pages_domain, with: Entities::PagesDomain
+        else
+          render_validation_error!(pages_domain)
+        end
+      end
+
+      desc 'Delete a pages domain'
+      params do
+        requires :domain, type: String, desc: 'The domain'
+      end
+      delete ":id/pages/domains/:domain", requirements: { domain: %r{[^/]+} } do
+        authorize! :update_pages, user_project
+
+        status 204
+        pages_domain.destroy
+      end
+    end
+  end
+end
diff --git a/lib/api/projects.rb b/lib/api/projects.rb
index aab7a6c3f93..4cd7e714aa2 100644
--- a/lib/api/projects.rb
+++ b/lib/api/projects.rb
@@ -119,6 +119,8 @@ module API
     end
 
     resource :projects do
+      include CustomAttributesEndpoints
+
       desc 'Get a list of visible projects for authenticated user' do
         success Entities::BasicProjectDetails
       end
diff --git a/lib/api/repositories.rb b/lib/api/repositories.rb
index ceee3226732..7887b886c03 100644
--- a/lib/api/repositories.rb
+++ b/lib/api/repositories.rb
@@ -57,7 +57,7 @@ module API
 
       desc 'Get raw blob contents from the repository'
       params do
-        requires :sha, type: String, desc: 'The commit, branch name, or tag name'
+        requires :sha, type: String, desc: 'The commit hash'
       end
       get ':id/repository/blobs/:sha/raw' do
         assign_blob_vars!
@@ -67,7 +67,7 @@ module API
 
       desc 'Get a blob from the repository'
       params do
-        requires :sha, type: String, desc: 'The commit, branch name, or tag name'
+        requires :sha, type: String, desc: 'The commit hash'
       end
       get ':id/repository/blobs/:sha' do
         assign_blob_vars!
diff --git a/lib/api/services.rb b/lib/api/services.rb
index 2cbd0517dc3..6454e475036 100644
--- a/lib/api/services.rb
+++ b/lib/api/services.rb
@@ -313,13 +313,13 @@ module API
           desc: 'The base URL to the JIRA instance API. Web URL value will be used if not set. E.g., https://jira-api.example.com'
         },
         {
-          required: false,
+          required: true,
           name: :username,
           type: String,
           desc: 'The username of the user created to be used with GitLab/JIRA'
         },
         {
-          required: false,
+          required: true,
           name: :password,
           type: String,
           desc: 'The password of the user created to be used with GitLab/JIRA'
@@ -374,6 +374,26 @@ module API
           desc: 'The Slack token'
         }
       ],
+      'packagist' => [
+        {
+          required: true,
+          name: :username,
+          type: String,
+          desc: 'The username'
+        },
+        {
+          required: true,
+          name: :token,
+          type: String,
+          desc: 'The Packagist API token'
+        },
+        {
+          required: false,
+          name: :server,
+          type: String,
+          desc: 'The server'
+        }
+      ],
       'pipelines-email' => [
         {
           required: true,
@@ -551,6 +571,7 @@ module API
       KubernetesService,
       MattermostSlashCommandsService,
       SlackSlashCommandsService,
+      PackagistService,
       PipelinesEmailService,
       PivotaltrackerService,
       PrometheusService,
diff --git a/lib/api/session.rb b/lib/api/session.rb
deleted file mode 100644
index 016415c3023..00000000000
--- a/lib/api/session.rb
+++ /dev/null
@@ -1,20 +0,0 @@
-module API
-  class Session < Grape::API
-    desc 'Login to get token' do
-      success Entities::UserWithPrivateDetails
-    end
-    params do
-      optional :login, type: String, desc: 'The username'
-      optional :email, type: String, desc: 'The email of the user'
-      requires :password, type: String, desc: 'The password of the user'
-      at_least_one_of :login, :email
-    end
-    post "/session" do
-      user = Gitlab::Auth.find_with_user_password(params[:email] || params[:login], params[:password])
-
-      return unauthorized! unless user
-      return render_api_error!('401 Unauthorized. You have 2FA enabled. Please use a personal access token to access the API', 401) if user.two_factor_enabled?
-      present user, with: Entities::UserWithPrivateDetails
-    end
-  end
-end
diff --git a/lib/api/users.rb b/lib/api/users.rb
index b6f97a1eac2..d80b364bd09 100644
--- a/lib/api/users.rb
+++ b/lib/api/users.rb
@@ -507,9 +507,7 @@ module API
       end
       get do
         entity =
-          if sudo?
-            Entities::UserWithPrivateDetails
-          elsif current_user.admin?
+          if current_user.admin?
             Entities::UserWithAdmin
           else
             Entities::UserPublic
diff --git a/lib/api/v3/branches.rb b/lib/api/v3/branches.rb
index 69cd12de72c..b201bf77667 100644
--- a/lib/api/v3/branches.rb
+++ b/lib/api/v3/branches.rb
@@ -14,9 +14,11 @@ module API
           success ::API::Entities::Branch
         end
         get ":id/repository/branches" do
-          branches = user_project.repository.branches.sort_by(&:name)
+          repository = user_project.repository
+          branches = repository.branches.sort_by(&:name)
+          merged_branch_names = repository.merged_branch_names(branches.map(&:name))
 
-          present branches, with: ::API::Entities::Branch, project: user_project
+          present branches, with: ::API::Entities::Branch, project: user_project, merged_branch_names: merged_branch_names
         end
 
         desc 'Delete a branch'
diff --git a/lib/api/v3/builds.rb b/lib/api/v3/builds.rb
index c189d486f50..f493fd7c7ec 100644
--- a/lib/api/v3/builds.rb
+++ b/lib/api/v3/builds.rb
@@ -8,7 +8,7 @@ module API
       params do
         requires :id, type: String, desc: 'The ID of a project'
       end
-      resource :projects do
+      resource :projects, requirements: API::PROJECT_ENDPOINT_REQUIREMENTS do
         helpers do
           params :optional_scope do
             optional :scope, types: [String, Array[String]], desc: 'The scope of builds to show',
diff --git a/lib/api/v3/commits.rb b/lib/api/v3/commits.rb
index 345cb7e7c11..ed206a6def0 100644
--- a/lib/api/v3/commits.rb
+++ b/lib/api/v3/commits.rb
@@ -11,7 +11,7 @@ module API
       params do
         requires :id, type: String, desc: 'The ID of a project'
       end
-      resource :projects, requirements: { id: %r{[^/]+} } do
+      resource :projects, requirements: API::PROJECT_ENDPOINT_REQUIREMENTS do
         desc 'Get a project repository commits' do
           success ::API::Entities::Commit
         end
@@ -72,7 +72,7 @@ module API
         params do
           requires :sha, type: String, desc: 'A commit sha, or the name of a branch or tag'
         end
-        get ":id/repository/commits/:sha" do
+        get ":id/repository/commits/:sha", requirements: API::COMMIT_ENDPOINT_REQUIREMENTS do
           commit = user_project.commit(params[:sha])
 
           not_found! "Commit" unless commit
@@ -86,7 +86,7 @@ module API
         params do
           requires :sha, type: String, desc: 'A commit sha, or the name of a branch or tag'
         end
-        get ":id/repository/commits/:sha/diff" do
+        get ":id/repository/commits/:sha/diff", requirements: API::COMMIT_ENDPOINT_REQUIREMENTS do
           commit = user_project.commit(params[:sha])
 
           not_found! "Commit" unless commit
@@ -102,7 +102,7 @@ module API
           use :pagination
           requires :sha, type: String, desc: 'A commit sha, or the name of a branch or tag'
         end
-        get ':id/repository/commits/:sha/comments' do
+        get ':id/repository/commits/:sha/comments', requirements: API::COMMIT_ENDPOINT_REQUIREMENTS do
           commit = user_project.commit(params[:sha])
 
           not_found! 'Commit' unless commit
@@ -119,7 +119,7 @@ module API
           requires :sha, type: String, desc: 'A commit sha to be cherry picked'
           requires :branch, type: String, desc: 'The name of the branch'
         end
-        post ':id/repository/commits/:sha/cherry_pick' do
+        post ':id/repository/commits/:sha/cherry_pick', requirements: API::COMMIT_ENDPOINT_REQUIREMENTS do
           authorize! :push_code, user_project
 
           commit = user_project.commit(params[:sha])
@@ -156,7 +156,7 @@ module API
             requires :line_type, type: String, values: %w(new old), default: 'new', desc: 'The type of the line'
           end
         end
-        post ':id/repository/commits/:sha/comments' do
+        post ':id/repository/commits/:sha/comments', requirements: API::COMMIT_ENDPOINT_REQUIREMENTS do
           commit = user_project.commit(params[:sha])
           not_found! 'Commit' unless commit
 
@@ -173,7 +173,7 @@ module API
 
               lines.each do |line|
                 next unless line.new_pos == params[:line] && line.type == params[:line_type]
-                break opts[:line_code] = Gitlab::Diff::LineCode.generate(diff.new_path, line.new_pos, line.old_pos)
+                break opts[:line_code] = Gitlab::Git.diff_line_code(diff.new_path, line.new_pos, line.old_pos)
               end
 
               break if opts[:line_code]
diff --git a/lib/api/v3/repositories.rb b/lib/api/v3/repositories.rb
index 41a7c6b83ae..f9a47101e27 100644
--- a/lib/api/v3/repositories.rb
+++ b/lib/api/v3/repositories.rb
@@ -8,7 +8,7 @@ module API
       params do
         requires :id, type: String, desc: 'The ID of a project'
       end
-      resource :projects, requirements: { id: %r{[^/]+} } do
+      resource :projects, requirements: API::PROJECT_ENDPOINT_REQUIREMENTS do
         helpers do
           def handle_project_member_errors(errors)
             if errors[:project_access].any?
@@ -43,7 +43,7 @@ module API
           requires :sha, type: String, desc: 'The commit, branch name, or tag name'
           requires :filepath, type: String, desc: 'The path to the file to display'
         end
-        get [":id/repository/blobs/:sha", ":id/repository/commits/:sha/blob"] do
+        get [":id/repository/blobs/:sha", ":id/repository/commits/:sha/blob"], requirements: API::COMMIT_ENDPOINT_REQUIREMENTS do
           repo = user_project.repository
           commit = repo.commit(params[:sha])
           not_found! "Commit" unless commit
@@ -56,7 +56,7 @@ module API
         params do
           requires :sha, type: String, desc: 'The commit, branch name, or tag name'
         end
-        get ':id/repository/raw_blobs/:sha' do
+        get ':id/repository/raw_blobs/:sha', requirements: API::COMMIT_ENDPOINT_REQUIREMENTS do
           repo = user_project.repository
           begin
             blob = Gitlab::Git::Blob.raw(repo, params[:sha])
diff --git a/lib/api/v3/services.rb b/lib/api/v3/services.rb
index 2d13d6fabfd..44ed94d2869 100644
--- a/lib/api/v3/services.rb
+++ b/lib/api/v3/services.rb
@@ -395,6 +395,26 @@ module API
             desc: 'The Slack token'
           }
         ],
+        'packagist' => [
+          {
+            required: true,
+            name: :username,
+            type: String,
+            desc: 'The username'
+          },
+          {
+            required: true,
+            name: :token,
+            type: String,
+            desc: 'The Packagist API token'
+          },
+          {
+            required: false,
+            name: :server,
+            type: String,
+            desc: 'The server'
+          }
+        ],
         'pipelines-email' => [
           {
             required: true,